Portion of a display screen with a graphical user interface



THE FIGURE is a front view of a portion of a display screen with a graphical user interface showing my new design.

The outer edge of the portion of a display screen is understood to be congruent with the outer edge of the graphical user interface. The broken line showing of portions of the graphical user interface form no part of the claimed design. 

CLAIM The ornamental design for a portion of a display screen with a graphical user interface, as shown and described. 